【418】C语言ADT实现Quack(stack+queue)

quack.h

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

typedef struct node *Quack;

Quack createQuack(void);
void push(int data, Quack qs);
void qush(int data, Quack qs);
int pop(Quack qs);
void makeEmptyQuack(Quack qs);
int isEmptyQuack(Quack qs);
void showQuack(Quack qs);

quack.c

#include "quack.h"

#define HEIGHT 1000

struct node{
	int array[HEIGHT];
	int top;
};

Quack createQuack(void){
	Quack qs;
	qs = malloc(sizeof(struct node));
	if (qs == NULL){
		fprintf(stderr, "Out of memory~\n");
		exit(EXIT_FAILURE);
	}
	qs->top = -1;
	return qs;
}

void push(int data, Quack qs){
	if (qs == NULL){
		fprintf(stderr, "push: quack not initialised\n");
	}
	else {
		if (qs->top >= HEIGHT - 1){
			fprintf(stderr, "push: quack overflow\n");
		}
		else {
			++qs->top;
			qs->array[qs->top] = data;
		}
	}
	return;
}

//used as queue, push element from bottom
void qush(int data, Quack qs){
	if (qs == NULL){
		fprintf(stderr, "qush: quack not initialised\n");
	}
	else {
		if (qs->top >= HEIGHT - 1) {
			fprintf(stderr, "qush: quack overflow\n");
		}
		else {
			for (int i = qs->top + 1; i > 0; i--) {
				qs->array[i] = qs->array[i-1];
			}
			qs->array[0] = data;
			qs->top++;
		}
	}
	return;
}

int pop(Quack qs){
	int retval = 0;
	if (qs == NULL){
		fprintf(stderr, "pop: quack not initialised\n");
	}
	else {
		if (isEmptyQuack(qs)){
			fprintf(stderr, "pop: quack underflow\n");
		}
		else {
			retval = qs->array[qs->top];
			--qs->top;
		}
	}
	return retval;
}

void makeEmptyQuack(Quack qs){
	if (qs == NULL){
		fprintf(stderr, "makeEmptyQuack: quack not initialised\n");
	}
	else {
		while (!isEmptyQuack(qs)) {
			pop(qs);
		}
	}
	return;
}

int isEmptyQuack(Quack qs) {
	// 0 means not empty
	int empty = 0;
	if (qs == NULL){
		fprintf(stderr, "isEmptyQuack: quack not initialised\n");
	}
	else {
		empty = qs->top < 0;
	}
	return empty;
}

void showQuack(Quack qs) {
	if (qs == NULL){
		fprintf(stderr, "showQuack: quack not initialised\n");
	}
	else {
		printf("Quack: ");
		if (qs->top < 0) {
			printf("<< >>\n");
		}
		else {
			int i;
			printf("<<");
			for (i = qs->top; i > 0; i--){
				printf("%d, ", qs->array[i]);
			}
			printf("%d>>\n", qs->array[0]);
		}
	}
	return;
}

separateQuack.c

// separateQuack.c: have both a stack and a queue in the same program
#include <stdio.h>
#include "quack.h"

int main(void) {
	Quack s = NULL;
	Quack q = NULL;

	s = createQuack();
	q = createQuack();

	push(1, s);
	push(2, s);
	printf("pop from s produces %d\n", pop(s));
	printf("pop from s produces %d\n", pop(s));

	qush(1, q);
	qush(2, q);
	printf("pop from q produces %d\n", pop(q));
	printf("pop from q produces %d\n", pop(q));

	//
	printf("\n----------------------------------\n\n");

	push(1, s);
	push(2, s);
	printf("pop from s produces %d\n", pop(s));
	printf("pop from s produces %d\n", pop(s));

	qush(1, q);
	qush(2, q);
	printf("pop from q produces %d\n", pop(q));
	printf("pop from q produces %d\n", pop(q));	

	//
	printf("\n----------------------------------\n");

	printf("\nstack example\n\n");	

	for (int i = 0; i < 4; i++) {
		printf("push: %d -- ", i+1);
		push(i+1, s);
		showQuack(s);
	}

	for (int i = 0; i < 4; i++) {
		printf("pop: %d --- ", pop(s));
		showQuack(s);
	}

	printf("\nqueue example\n\n");

	for (int i = 0; i < 4; i++) {
		printf("qush: %d -- ", i+1);
		qush(i+1, s);
		showQuack(s);
	}

	for (int i = 0; i < 4; i++) {
		printf("pop: %d --- ", pop(s));
		showQuack(s);
	}

	return EXIT_SUCCESS;
}

Run in terminal

gcc quack.c separateQuack.c && ./a.out

output:

pop from s produces 2
pop from s produces 1
pop from q produces 1
pop from q produces 2

----------------------------------

pop from s produces 2
pop from s produces 1
pop from q produces 1
pop from q produces 2

----------------------------------

stack example

push: 1 -- Quack: <<1>>
push: 2 -- Quack: <<2, 1>>
push: 3 -- Quack: <<3, 2, 1>>
push: 4 -- Quack: <<4, 3, 2, 1>>
pop: 4 --- Quack: <<3, 2, 1>>
pop: 3 --- Quack: <<2, 1>>
pop: 2 --- Quack: <<1>>
pop: 1 --- Quack: << >>

queue example

qush: 1 -- Quack: <<1>>
qush: 2 -- Quack: <<1, 2>>
qush: 3 -- Quack: <<1, 2, 3>>
qush: 4 -- Quack: <<1, 2, 3, 4>>
pop: 1 --- Quack: <<2, 3, 4>>
pop: 2 --- Quack: <<3, 4>>
pop: 3 --- Quack: <<4>>
pop: 4 --- Quack: << >>